863
FNCA52 TJSJ 251930
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 PM AST TUE AUG 25 2026
DISCUSSION
A MARGINAL FIRE WEATHER RISK WILL CONTINUE THROUGH THE REMAINDER
OF TODAY, MAINLY DUE TO THE PRESENCE OF DRY FUELS. ALTHOUGH
RELATIVE HUMIDITY VALUES MAY BRIEFLY DECREASE DURING PEAK
HEATING, INCREASING TROPICAL MOISTURE ASSOCIATED WITH A PASSING
TROPICAL WAVE SHOULD GENERALLY KEEP RH ABOVE CRITICAL LEVELS.
OVERALL, THE COMBINATION OF HIGHER MOISTURE SHOULD LIMIT THE
POTENTIAL FOR RAPID FIRE SPREAD AND KEEP THE OVERALL FIRE WEATHER
THREAT MARGINAL FOR THE REST OF THE AFTERNOON.
PRZ014-260800-
SOUTHEAST COASTAL PLAINS-
330 PM AST TUE AUG 25 2026
TONIGHT WED WED NIGHT THU
CLOUD COVER MCLEAR MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 30 10 20
TEMP (24H TREND) 77 (-1) 94 (+2) 77 94
RH % (24H TREND) 86 (+2) 43 (-12) 85 40
WIND 20FT/EARLY(MPH) E 10 E 12 NE 13 E 14 G22
WIND 20FT/LATE(MPH) E 10 E 16 G23 NE 10 E 17 G25
MIXING HGT(FT-AGL/MSL) 5270 5430
TRANSPORT WND (MPH) E 15 E 17
VENT RATE (KT-FT) 68510 81450
DISPERSION 5 5
DSI 4 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ015-260800-
SOUTHERN HILLS-
330 PM AST TUE AUG 25 2026
TONIGHT WED WED NIGHT THU
CLOUD COVER MCLEAR MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 40 10 40
TEMP (24H TREND) 73 (-2) 92 (+4) 72 91
RH % (24H TREND) 96 (+5) 52 (-13) 96 53
WIND 20FT/EARLY(MPH) E 10 E 11 NE 13 E 12
WIND 20FT/LATE(MPH) E 11 E 12 NE 12 E 13
MIXING HGT(FT-AGL/MSL) 5930 6210
TRANSPORT WND (MPH) E 13 E 14
VENT RATE (KT-FT) 65230 74520
DISPERSION 5 5
DSI 3 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ016-260800-
NORTH COASTAL PLAINS-
330 PM AST TUE AUG 25 2026
TONIGHT WED WED NIGHT THU
CLOUD COVER PCLDY MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 10 30 40
TEMP (24H TREND) 75 (-3) 93 (+1) 76 92
RH % (24H TREND) 97 (+5) 58 (-9) 96 58
WIND 20FT/EARLY(MPH) E 14 E 12 E 17 E 14
WIND 20FT/LATE(MPH) E 10 NE 19 E 13 E 18
MIXING HGT(FT-AGL/MSL) 4800 4930
TRANSPORT WND (MPH) E 14 E 15
VENT RATE (KT-FT) 57600 64090
DISPERSION 5 5
DSI 4 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ017-260800-
NORTHERN HILLS-
330 PM AST TUE AUG 25 2026
TONIGHT WED WED NIGHT THU
CLOUD COVER MCLEAR MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 10 10 10 60
TEMP (24H TREND) 73 (-2) 91 (+2) 74 90
RH % (24H TREND) 98 (+2) 61 (-8) 98 62
WIND 20FT/EARLY(MPH) E 11 E 11 E 14 E 12
WIND 20FT/LATE(MPH) E 6 NE 17 E 11 NE 16
MIXING HGT(FT-AGL/MSL) 5550 5970
TRANSPORT WND (MPH) E 12 E 13
VENT RATE (KT-FT) 55500 65670
DISPERSION 5 5
DSI 3 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ018-260800-
WEST COAST-
330 PM AST TUE AUG 25 2026
TONIGHT WED WED NIGHT THU
CLOUD COVER MCLEAR PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 20 60 10 60
TEMP (24H TREND) 74 (-1) 94 (+1) 74 94
RH % (24H TREND) 98 (+2) 58 (-8) 97 59
WIND 20FT/EARLY(MPH) E 9 E 11 NE 16 E 11
WIND 20FT/LATE(MPH) E 10 E 12 NE 14 E 11
MIXING HGT(FT-AGL/MSL) 4540 4520
TRANSPORT WND (MPH) E 7 E 7
VENT RATE (KT-FT) 27240 27120
DISPERSION 5 5
DSI 3 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ019-260800-
EASTERN INTERIOR-
330 PM AST TUE AUG 25 2026
TONIGHT WED WED NIGHT THU
CLOUD COVER PCLDY MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 10 40 40
TEMP (24H TREND) 74 (-3) 92 (+2) 74 92
RH % (24H TREND) 97 (+5) 55 (-10) 96 56
WIND 20FT/EARLY(MPH) E 11 E 11 NE 13 E 11
WIND 20FT/LATE(MPH) E 11 E 12 E 13 E 12
MIXING HGT(FT-AGL/MSL) 6680 6610
TRANSPORT WND (MPH) E 13 E 15
VENT RATE (KT-FT) 73480 85930
DISPERSION 5 5
DSI 3 6 5 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ022-260800-
LUQUILLO MOUNTAIN RANGE-
330 PM AST TUE AUG 25 2026
TONIGHT WED WED NIGHT THU
CLOUD COVER PCLDY MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 10 40 40
TEMP (24H TREND) 72 (-2) 87 (+3) 71 87
RH % (24H TREND) 99 (+3) 63 (-11) 100 63
WIND 20FT/EARLY(MPH) E 9 E 10 NE 11 E 10
WIND 20FT/LATE(MPH) E 9 E 10 E 11 E 11
MIXING HGT(FT-AGL/MSL) 4790 4830
TRANSPORT WND (MPH) E 14 E 15
VENT RATE (KT-FT) 57480 62790
DISPERSION 5 5
DSI 4 6 5 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ023-260800-
CENTRAL MOUNTAIN RANGE-
330 PM AST TUE AUG 25 2026
TONIGHT WED WED NIGHT THU
CLOUD COVER MCLEAR PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 20 40 0 60
TEMP (24H TREND) 70 (-3) 90 (+5) 70 89
RH % (24H TREND) 100 (+4) 62 (-12) 99 63
WIND 20FT/EARLY(MPH) E 6 E 8 NE 13 E 9
WIND 20FT/LATE(MPH) E 5 NE 10 NE 10 E 10
MIXING HGT(FT-AGL/MSL) 6910 7120
TRANSPORT WND (MPH) E 9 E 10
VENT RATE (KT-FT) 55280 64080
DISPERSION 5 5
DSI 2 6 2 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ024-260800-
CAYEY MOUNTAIN RANGE-
330 PM AST TUE AUG 25 2026
TONIGHT WED WED NIGHT THU
CLOUD COVER MCLEAR MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 20 30 40
TEMP (24H TREND) 73 (-1) 89 (+4) 72 88
RH % (24H TREND) 98 (+1) 58 (-11) 99 59
WIND 20FT/EARLY(MPH) E 8 E 10 NE 11 E 10
WIND 20FT/LATE(MPH) E 9 E 11 NE 10 E 12
MIXING HGT(FT-AGL/MSL) 5360 5570
TRANSPORT WND (MPH) E 14 E 16
VENT RATE (KT-FT) 64320 77980
DISPERSION 5 5
DSI 3 6 5 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ025-260800-
VIEQUES-
330 PM AST TUE AUG 25 2026
TONIGHT WED WED NIGHT THU
CLOUD COVER MCLEAR MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 20 40 40
TEMP (24H TREND) 81 (0) 91 (+1) 80 91
RH % (24H TREND) 84 (+1) 57 (-6) 83 56
WIND 20FT/EARLY(MPH) E 14 E 12 NE 16 E 14
WIND 20FT/LATE(MPH) E 14 NE 14 E 16 E 13
MIXING HGT(FT-AGL/MSL) 3440 3150
TRANSPORT WND (MPH) E 16 E 16
VENT RATE (KT-FT) 48160 44100
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ026-260800-
CULEBRA-
330 PM AST TUE AUG 25 2026
TONIGHT WED WED NIGHT THU
CLOUD COVER MCLEAR MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 20 40 40
TEMP (24H TREND) 80 (-2) 92 (+2) 80 91
RH % (24H TREND) 88 (+2) 59 (-10) 88 59
WIND 20FT/EARLY(MPH) E 14 E 12 NE 16 E 14
WIND 20FT/LATE(MPH) E 14 E 14 E 16 E 13
MIXING HGT(FT-AGL/MSL) 3400 3200
TRANSPORT WND (MPH) E 18 E 17
VENT RATE (KT-FT) 54400 48000
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ027-260800-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 PM AST TUE AUG 25 2026
TONIGHT WED WED NIGHT THU
CLOUD COVER MCLEAR PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 50 0 40
TEMP (24H TREND) 76 (-2) 94 (+2) 76 94
RH % (24H TREND) 92 (+7) 45 (-11) 88 44
WIND 20FT/EARLY(MPH) E 11 E 14 E 13 E 13
WIND 20FT/LATE(MPH) E 14 E 14 G22 NE 10 E 14 G22
MIXING HGT(FT-AGL/MSL) 4780 5360
TRANSPORT WND (MPH) E 13 E 13
VENT RATE (KT-FT) 52580 58960
DISPERSION 5 5
DSI 5 6 2 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
VIZ001-260800-
SAINT THOMAS AND SAINT JOHN-
330 PM AST TUE AUG 25 2026
TONIGHT WED WED NIGHT THU
CLOUD COVER MCLEAR PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 20 40 40
TEMP (24H TREND) 79 (-2) 90 (+2) 79 89
RH % (24H TREND) 90 (+4) 61 (-8) 88 59
WIND 20FT/EARLY(MPH) E 16 E 13 NE 16 E 14
WIND 20FT/LATE(MPH) E 16 NE 13 E 16 E 13
MIXING HGT(FT-AGL/MSL) 3280 3180
TRANSPORT WND (MPH) E 17 E 18
VENT RATE (KT-FT) 49200 50880
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
VIZ002-260800-
ST CROIX-
330 PM AST TUE AUG 25 2026
TONIGHT WED WED NIGHT THU
CLOUD COVER MCLEAR MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 20 30 40
TEMP (24H TREND) 80 (-1) 91 (+2) 79 91
RH % (24H TREND) 87 (-1) 62 (-6) 87 60
WIND 20FT/EARLY(MPH) E 14 E 13 NE 16 E 14
WIND 20FT/LATE(MPH) E 16 NE 13 E 14 E 13
MIXING HGT(FT-AGL/MSL) 4720 4380
TRANSPORT WND (MPH) E 18 E 18
VENT RATE (KT-FT) 75520 70080
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
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